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Article
A Review of Cretaceous dipnoans from Argentina (Sarcopterygii Dipnoi) with Descriptions of New Species
Revista del Museo Argentino de Ciencias Naturales
  • Sebastian Apasteguia
  • Federico L. Agnolin
  • Kerin M. Claeson, Philadelphia College of Osteopathic Medicine
Document Type
Article
Publication Date
1-1-2007
Abstract
In this paper we review the fossil ceratodontiform record from the Cretaceous of Argentina. We report the oldest dipnoan record from Argentina, coming from the Cenomanian of Northwestern Patagonia, Rio Negro province. The species Ceratodus iheringi is reassigned. Additionally, four new species are described. Ceratodontiforms were considered extinct in Laurasia after the mid-Cretaceous, with a brief reappearance during the Maastrichtian before their definitive extinction from South American and most of the world by K/P boundary. Based on our phylogenetic analysis, using characters derived primarily from tooth plates, we propose that the genus Metaceratodus is more closely related to Neoceratodus than either is to Ceratodus or Ptycheratodus, supporting prior hypotheses. In two most parsimonious trees, the two new genera here described are basal, being one of them sister taxa to Ceratodontoidea nov. and the other unresolved with respect to Protopterus.
Comments

This article was published in Rev. Mus. Argentino Cienc. Nat., Volume 9, Issue 1, Pages 27-40.

The published version is available at http://www.macn.secyt.gov.ar/investigacion/descargas/publicaciones/revista/09/rns_vol09-1_27-40.pdf.

Copyright © 2007 Museo Argentino de Ciencias Naturales.

Citation Information
Sebastian Apasteguia, Federico L. Agnolin and Kerin M. Claeson. "A Review of Cretaceous dipnoans from Argentina (Sarcopterygii Dipnoi) with Descriptions of New Species" Revista del Museo Argentino de Ciencias Naturales Vol. 9 Iss. 1 (2007) p. 27 - 40
Available at: http://works.bepress.com/kerin_claeson/1/